What is the best treatment for a hamstring strain?

Rest and stretching: For a grade 1 or 2 strains recovery involves rest, stretching, and controlled strengthening. Icing and stretching afterwards can be done a few times a day. When pain free full range of motion is attained through stretching, you may progress to controlled strengthening that would include stationary bicycle and eccentric exercises.

Physical therapy: Physical therapy involving temporary activity modification, pain control, flexibility, strengthening, and sport specific exercises is the best treatment.